Sol Ring

Clone

You may have Clone enter as a copy of any creature on the battlefield.

Counterspell

Ancestral Recall

Island

Volcanic Island

Mana Drain

Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.

Prodigal Sorcerer

{T}: Prodigal Sorcerer deals 1 damage to any target.

Unsummon

Return target creature to its owner's hand.

Blood Moon

Timetwister

Each player shuffles their hand and graveyard into their library, then draws seven cards. (Then put Timetwister into its owner's graveyard.)

Braingeyser

Mox Ruby

Vesuvan Doppelganger

You may have Vesuvan Doppelganger enter as a copy of any creature on the battlefield, except it doesn't copy that creature's color and it has "At the beginning of your upkeep, you may have this creature become a copy of target creature, except it doesn't copy that creature's color and it has this ability."

Fireball

This spell costs {1} more to cast for each target beyond the first.
Fireball deals X damage divided evenly, rounded down, among any number of targets.

Black Lotus

{T}, Sacrifice Black Lotus: Add three mana of any one color.

Wheel of Fortune

Each player discards their hand, then draws seven cards.

Mox Sapphire

Control Magic

Enchant creature
You control enchanted creature.

Lord of Atlantis

Other Merfolk get +1/+1 and have islandwalk. (They can't be blocked as long as defending player controls an Island.)

Time Walk

Library of Alexandria

{T}: Add {C}.
{T}: Draw a card. Activate only if you have exactly seven cards in hand.